Whitepapers

The Value of InPb Solders (English)

Summary: The indium-lead (InPb) binary system offers numerous alloy combinations. These materials possess mechanical and physical properties which make them useful in many demanding applications. With small additions of silver (Ag), additional alloys are created, rounding out this set of materials and providing us with a full set of performance capabilities. This is especially valuable in the electronics assembly soldering arena.
With melting temperatures ranging from 154°–313°C, this alloy family offers numerous choices for accommodating temperature-sensitive applications, as well as step-soldering operations. InPb alloys also possess metallurgical properties that make them particularly suitable for soldering to thick Au metallizations.
Assemblers should not be dissuaded from using this versatile alloy family just because the joints that they form may not have the same visual characteristics that SnPb and Pb-free alloys have.

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